Before the Interview
Give candidate's time - Once you have reviewed CVs and made your selection, give your chosen candidates a couple of days notice so they can make the necessary arrangements to get to the interview.
Explain the interview structure - If there are going to be expected to take tests or bring in examples of their work, don;t forget to tell them so they can come fully prepared.
Explain the process - Even before they meet you, let them know about how long it will take to make the hiring decision and how many stages to the interview there are.
During the Interview